Grinding-machine.



J. W HAMPTON GRINDING MACHiNE.

APPLICATION FFLED APR. 9. @911.

3 SHI'JHS'SHEET l.

J. W. HAMPTON.

GRfNDiNG MACHINE,

APPLICATHJN men APR, 9. I917 1,268,967. Edwin-(1.1m 11. 1918.

J. W HAMPTON.

GRINDING MACHINE.

APPucATmN mm APR. 9. Hmv

1,268,967. laivnh-d Junv 11, 1918.

3 SHLEYS SHEE? 3.

" 0 auto rises from the center of the said legs,

UNITED STATES PATENT OFFICE.

JOHN WADE HAMPTON, OF BEREA, OHIO, ASSIGNOR TO THE CLEVELAND STONE COH-PANY, OF CLEVELAND, OHIO, A CORPORATION OF GHIO.

GRINDING-MACHINE Specification of Letters Patent Patented June 11, 1918Application filed April 9,!917.

To add "whom it may concern Be it known that I. John WADE IIAMP- TON, acitizen of the United States, residing at Berea, in the county ofCuyahoga and State of Ohio, have invented a certain new and usefulImprovement in Grinding Machines, of which the following is a full,clear, and exact description.

en ax heads, or axes, as they are comcalled and as they will behereinafter come from the forge, they have to be and sharpened. Theconventional shape to which these ax forgings have to be ground is shownin Figure 6 of the drawings. They are slightly convex on both sides, andthe sharpened edge is also slightly convex.

The present invention resides in the machine shown in the drawing, soconstructed that a plurality of ax forgings may be put into its embraceafter they come from the forge, whereupon the machine will automaticallygrind them into the required shape so far as concerns the sides andcutting edge thereof.

he invention consists in the construction. and combination of partswhich are em. bodied in theunachine shown in the accompanying drawingsand are hereinafter described, all as definitely pointed out in the apended claims.

11 the drawings, Fig. l is a vertical. sectional view of a machine inwhich the invention is embodied; Fig. 2 is a plan view of said machine;Fig. 3 1s a sectional end view on line 3-3 of Fig.2 of one of the axholding arms and an ax held thereby; F ig. 4 is a sectional view of oneof the arms In the line indicated by 4-4 on Fig. 2; Fig. 5 is asectional plan view, the section being in the plane indicated by line5-5 on 1; and Fig. 6 is a view of such an ax as may be ground into shapein the machine shown in the other views.

The frame work of the machine includes a base 10 and vertical tubularmet 12 which base, suitable legs 16, an annular trough 15 sup orted byan annular table fixeif to said trough, and various brackets to behereinmonl calle ground into shape after referred to to whatever extentmay be necessary.

Thdgrindston' 20. 1s a horizontally disposed annulus; and the grindingof the axes Serial No. 160.804.

is done by the upper which. is concentric with and outside of the I post12; and said sleeve 22 has a sliding driving tongue and grooveconnection 22 with this shaft. The platfornl 21 is supported on anantifriction step bearing 25 carried by a vertically movable externallythreaded sleeve 30 which has a slidin cu gagcmcnt with the shaft 23 andhas in its top a recess 3 for the reception of the anti frietion stepbearing 25. This sleeve 30 is concentric with the post 12. and isvertically movable with respect thereto. It passes through a hole in thetable 1+1 and is formed with a vertical groove 32 for the reception of atongue fixed to that table Whereb this sleeve may not rotate. A nut 34whic is screwed onto the sleeve 30 rests and is 1'0- tatable upon thetable 14. formed with external. gear teeth 35 which are in mesh with apinion 3G fixed to a vertical shaft 37. This passes through and isrotatably mounted in a hearing which is a part. of the table 14. Theshaft 37 has at its lower end a beveled gear 38 which meshes with abevel gear 105 fixed to a horizontal shaft 106, mounted in suitablebearings and having an operating hand wheel on each end. When the shaft37 is turned, the nut 3-1 is rotated and the sleeveiill willthereby beraised with the result of raising the platform 21 and the grindstonethereon. This vertical ad justmcnt of the grindstone is for the purposeof keeping the upper operative face thereof in substantially the sameplane as said face is ground off by the operation of the machine.

The shaft 23 has a bolt pulley 27 keyed to it near its lower end. andthis shaft and pulicy are supported by an antifriction step bearing 28mounted in a recess 10 in the base 10 of the nmchinc. It is to beunderstood that a belt will engage with this pulley :27 whereby thegrmdstono will be turned.

Concentrically arranged within the post 12 and rotatably mounted thereinis a vertical tubular shaft 40. This shaft has rigidly secured to itsupper end a head 4-1 and this head rests upon the upper ends of the postIhis nut is 35'. head to be ground.

" "big be 12 and the vertical ehaft 23. and thereby the tnbularshaft 40is supported in the position shown, A. large gear'45 is fixed to theloyver end of the shaft 40, and thereby it may be turned by a. suitabletrain-of gearing which ill be presently described. This vertical shaft40 me have the desired speed relative to that of t e Tndstone. Rotetableilfiie m'ings carried by this tububar shaft 40, and concentricallydisposed therein; is a shaft 50 which projects at both ends from saidtubular shaft and it has a large gear 51 fixed to its lower end wherebyit may be rotated. The collar 52 is fixed to its up or end and thisrests u on the upper 'end 0 the shaft 40 whereby t 1e shaft 50 ismeintalined in the stated position. There is also fixed to theprojecting ripper end of the shaft 50 an eccentric 53 which me be e 2part of the collar 52. Alltlm-e of t edescribed shaft-s40 and 50 and theshaft 23 and with it the grindstone are all rotated in the somedirection but at different speeds by suitable mechanism some of whichhas al- 25 ready been partly explained. A plurality of ex holding levers60 are connected each by a hall and socket joint 61 with the head 41,and extend from the said ball andsocket commotion in a substentiellyradial but downwardly inclined direction toward the upper surfni'e ofthe grindstone 20; and each of these arms is provided at its free endwith means by which to ,clamp to its under face an ax T here i anoscillating ring 70 mounted 'upon the head 41 in a horizontal position,said ring' being concentric with l'hepost 12.

A bell crank lever 80in ivoted on a verticalf axis toL-the head an onearm 81 of this lei'er has near its outer end in horizontal slot-'82." Averticnlpiu 72 lixod totl o' ring "3'0 projects up into this slolu'llnother Min of this bell crank lever 89 1mm long arcn5 shaped slot 83,The eccentric 53 above r c-i ferred to is surrounded by an eccentricstrap 54 which is connected with the mm of the leverRO through whichsaid longnrc-slmped "slot 83in; formed by means of a pin 55 9 which maybe fixed to the later 80 at any point in the length of said-slot 83. Itis obvious. therefore, that as the Qhlift 7 turns this lam-'83 will berocked. with the reeult of'impm'ting'to the ring 70 ,u back and forth,oecillotmg movement with reopen-l to the heodi ih'clen th ofwhihmovenent may be varied as- 'eelred.

. It is; to beremembered;however,that. the

1, andWIIet'thiEhead constantly isfi'otetoau'se it la -fixed to the rotiting elicited? t As'sooiaitedjwithnach lever aremean this rin'g TQ forcausing said carried" by y levers to oscillate about their ball andblock when the surface of'the ex is ngarly finished v11l come down 1nlo4-i1ntnoi4 1yitl1 a nod ex and therefore determines; when the grindingthereof shall rennet.

nu me rm e other? similar apms are shown 1 the on Thegse moans consistof lnvq -jamvs 67 nvol'ed to the em t-ll. the lower ends of Aepiing68conneolsthe upper ends of these-twp awe and tends to move them sosocket connections with the bend; -e=mid moans consisting of two pins 75which cxtend upon opposite sides; and into engagement with the lever 60.

It is obvious therefore that eaohnit -hold- 70 in lever 60 will haveimported to it a pccu ier motion, namely, it will oscillate on acircular arc of which the center is the center of the hull and socketjoint by which it in'connected with the Head 41, and of CUUISG thismovement will. be imported to the on head with the result of grindingthe curved vuttin r edge on said ,ax. i

It desire le alz-mitlmt the ax shall have a rocking motion from side toside in con tool. with thegrinding face of the grindstone in'order togrind the outer face of the-ax .into the conventional convex shepe. Thisslight mocking-motion or twieting of the arm 0 is irodooed by means .ofa. pin 63 which is KG-(hi0 and extendn downward from lhelever '60 into nhomer) in :1. part 46 rigidly fastenedto theiroztntmg head 40. This arm60 oscillates in an arc oi which the bull and si'ickct joint is thecenter. The lower part of this arm 60, or rather the lower end of thepin (#3 is restricted in this oscillating movement by its engagement inthe hole 45 of the port $6. Th s rocking motion .of each an in contentwith the grindslone ounces the side ofthe axio be ground into convex'for nl B ilt theex-act shape of this surfncewis;cleterminediiry apattern block 64 fixed to the ,11r1n ,n'l1)ch flange 41 on the head.'lEhc engogement atte nrblooknitli this; finiige also lnnll's thedownward niui'en eiili dif the arm \Vhile only one of the,a x holdinglevers 60 is shown completely in 'thc droning-n, the

places for the connection in ilm machine of and 'it is to beundorstoodthntlon of ll eso arms more or l(-.-:H are to be pivoted in thedescribed manner lothchea'd 40 and to'projcct 'thcrefroni insnbstnntinliy redial down- .wiu-tllyinclined directions sorihet the axesjfi xed to ilie ouds of tl wseer eev'ill engage tligfltop"surfin-u ofthe gblut n grindstone. At: the oulenend of elicit o tbeoellever :irms60 are, lueuns slated -for holding wh ch nee beveled nnil iii-e og'lqiled to enter the eye t of the ex ii -ed uud clamp it up against theunder fu ceoithe arm 60.

as. "to rblaSofllB on when permitted soto crating 111g 9; which willgobetween and ran H a bevel "on Fig. 5, and he wi each pair of aws 67 larshaft 40 consists which the terminal gear 90 en es the r '45 on thelower end of this raft.

train of gears includes the vertical shaft 91, and the other terminalmember of this train is a worm wheel 92 which is engaged by a worm 98 ona worm shaft 94.which carries step pulleys 95 by means of which thisshaft may be rotated at either of three speeds according torequirements.

The gear 51 which is fixed to shaft also receives "'6 rotary motion fromthis same shaft h l-through a bevel gear 96 fixed to the said shaft inen agement with r 97 that is fix to a vertical shaft 98 aving on itslower end a pinion 99 which in turn engages with a pinion 100 which inturn engages with the ear 51.

he operator of a machine 0 this sort may stand adjacent either side ofthe ma.- chine adjacent the ositions marked B-- B lput' into the graspof one of the ex heads to be ground, and then allow its weight and theweight of the outer end of the arm to carry the lower face of this exagainst the top surface of the 'ndstone.

The grindstone will c revolvm at about three hundred turns per minute.he shaft 40 will be rotated at a speed such that it will turn throughone bomplete revolution or one half a revolution during that period oftime required to grind the face of the ax, so about 10 to 14 minutes.

ilhe shaft 50 will be rotated at about seven to nine revolutions perminute. Therefore, whi an given arm. 60 is;v being moved around t e'circle from the point at which the ex is fastened thereto until it getsback to substantially the same point, said lever will he rocked sidewiseby the oscillation of the ring from seventy to one hundred and twentyfive times and each time said lever will have the sli ht rockin movementwhich will cause the grinding w eel to put the convex face on said ax..

In using the above described machine, the operator-stands at or near oneor the other of the two positions-indicated by 5. where he is withineasy reaci of one of the haud \v'lxccls on the shaft.

An each of the ox holding'arms 60 comes to him he nits an ex in theembrace of the clamping evices 67 thereon. and late that tax, drop downonto the rotating grindstone; 'undhe does this until each 7 carries anax n theposition stated. The

of these arms slowly rotating head. carries each of these arms entirelyaround and back to the start ing point. As it is bein so carried, it isbeing oscillated as uponlt shaft 50 may B on Fig.

e substantially ver tical axis of the bell and socket connection withsaid head by the oecilleting ri'ngKO. At the same time said am is beingoscil' lated abouothe longitudinal axis of said arm. At all times t eface of the, be-

mg pressed down by its own weight and the weight of the arm on the uppersu'r fince of the rotating grindstone,-with the result that beforeanyarm comes around to the loadin Eosition referred to, the .faoe of theex l ave been ground Into the desired shape. Duringvthe last part ofthis wine!- ing operation the pattern block wil have come into contactwith the flange 41' on head 41 and this engagement accomplishes twousei'ul purposes, viz first it causes the twisting oscillation of thearm :60 totake place in a precise path such as results in the accurateshaping of the convex surface of the ex; and second, it limits theclownward movcment of the arm andrconsequently prevents the grindingaway of the ax after it has been ground to the extent desired.

ouch arm-60 reaches the loading position, tho ax whose surface has beenground will he removed and another ax putin its, place. Obviously,therefore, a plurality of axes, as man as there are arms, may beundergoing t e Witi some fobs, the grinding e'the head is turn e half ofone revolution. In that ovqnt an operator may be stationed at each ofthe loading ositions marked B; and each man will take romleach arm theround ax which the other man put onto said arm.

The rates of rotation of the head 41 and be easily chaned withoutchanging the rate of rotation 0 stone by shifting the driving beltto oneor the other 'of the cone pulleys 95 on shaft 94.

avingdescribed my inventioml claim 1. In a machine of the characterspecified, the combination of a rotatableihorizontal gnndstone having ashaped top, rindin'g surface, a concentric rotatable hea ,means tosimultaneously rotate said grindstone and rinding operation at the V icethe grindi head, theformer rapidly and the latter slowly, a

d and extendi .over' and toward said grmdstone, means t clam the work tothe under side offlie outer to oscillate said arm about the sub-Sbdnlilfllli vertical axis of the pivotal connection etween it and, saidhead as said work holding-arm pivoted tosaid -of said arm, and

pivotal connection is being carried around r work a so other lever armto cause said lever to oscillate upon itspivotal support, a concentricvertical shaft, an eccentric fixed thereto, an eccentric strap aboutsaid eccentric, and an adjustable connection between said eccentricstrap and the other arm of said bell crank lever.

11. In a machine of the character specified, the combination of arotatable horizontal grindstone having a shaped top grinding surface, aconcentric rotatable head, means for simultaneously rotating said twoparts,the former rapidly a d the latter slowly, a plurality of workolding arms connected to said head by universal joint connections andextending therefrom over and toward said grindstone, a ringconcentrically mounted upon said head, means to oscillate said ringabout its axis relative to said head, and means producing an .operativeengagement between said ring and all of said work holding arms.

12. In a machine of the character specified, the combination of arotatable horizontal grindstone having a shaped top grinding surface, aconcentric rotatable head, means for simultaneously rotating said twoparts, .the former rapidly and the latter slowly, means to adjust saidgrindstone verticall upward, a work holding arm connected with said headby a ball and socket joint and extended over and toward said grindstone,means to clamp the work to the under side of the outer end of said arm,and means to oscillate said arm about the substantially vertical axis ofthe universal connection between it and said head.

13. In a machine of the characterspecified, the combination with a basehaving an upright cylindrical post, a shaft rotatably mounted around andupon said post, a. grindstone supporting platform which embraces saidshaft and has a sliding driving connection therewith, a step bearingsupporting said platform, an annular grindstone supported upon saidplatform having a shaped top grinding surface, a tubular shaftconcentrically mounted within sa'd post, a head fixed to the projectingupper end of said shaft, a work holding arm,connected with said head byuniversal joint connection and extending therefrom over and toward thegrindstone, a ring concentrically mounted upon said head, connectionsbetween it and said arm, a shaft concentrically mounted within the headcarrying tubular shaft, a bell crank lever pivoted to said head andoperatively connected with said oscillating ring. an eccentric fixed tothe projecting upper end of said central shaft means connecting it withthe other arm of said bell crank lever, and means for rotating the saidthree shafts at different rates of speed.

14. In a machine of the character specified, the combination of a basehaving a. cylindrical tubular upright post, a tubular shaft around androtatably mounted upon said post, a platform around and concentric withsaid shaft and having a sliding driving connection therewith, a stepbearing for said platform, a vertically adjustable member supportingsaid step bearing, means to adjust said member vertically, and means torotate said shaft.

15. In a machine of the character specified, the combination of a basehaving a cylindrical tubularupright post, a tubular shaft around androtatably mounted upon said post, a platform around and concentric withsaid shaft and having a sliding driving connection therewith, a stepbearing for said platform, an externally threaded cylindrical tubularmember supporting said step bearing, means to prevent the rotation ofsaid member, a rotatable threaded nut having external gear teeth whichisscrewed onto said member, a fixed table on which said nut is supported,a pinion engaging said nut, and means to rotate said pinion.

16. In a machine of the character specified, the combination of arotatable horizontal grindstone, a concentric rotatable head, and aconcentric rotatable shaft, means to simultaneously rotate said threerotatable members at different rates of speed, the grindstone rapidly,the head very slowly, and the shaft at an intermediate rate, a rinmounted concentrically upon said head and capable of oscillation thereonabout its axis, a bell crank lever pivoted on a vertical axis to saidhead and connected with said ring, an eccentric fixed to the rotatableshaft, an eccentric strap embracing the same and connected with theother end of said bell crank lever, a plurality of work holding armspivoted 'to said head and extending outward therefrom over said ring anddownward to the top surface of the grindstone, means carried by theouter ends of these arms for holding the work, and means carried by saidoscillating ring engaging the several arms to cause the arms tooscillate on their pivotal connection with said head.

In testimony whereof. I hereunto aliix my signature.

J OHN' WADE HAMPTON.

